The case on the left is a vacuum metallized Darth Vader case that was used
to test the metallization process for the
C-3P0 cases. About one hundred
of these cases are known to exist, and of course, due to the exposure of
this piece in Steve Sansweet's Star Wars: From Concept to Screen to
Collectible,
there are numerous fakes on the market. The case on the right is
a white mold test for the Darth Vader case, with the appearance of a
white marble finish.